package com.mjlf.framework.mydata;

import org.junit.Test;

import java.sql.*;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class MySQLDemo {

    // JDBC 驱动名及数据库 URL
    static final String JDBC_DRIVER = "com.mysql.jdbc.Driver";
    static final String DB_URL = "jdbc:mysql://localhost:3306/sampledb";

    // 数据库的用户名与密码，需要根据自己的设置
    static final String USER = "root";
    static final String PASS = "123456";

    public static void main(String[] args) {
        Connection conn = null;
        Statement stmt = null;
        try {
            // 注册 JDBC 驱动
            Class.forName("com.mysql.jdbc.Driver");

            // 打开链接
            System.out.println("连接数据库...");
            conn = DriverManager.getConnection(DB_URL, USER, PASS);

            // 执行查询
            System.out.println(" 实例化Statement对象...");
            stmt = conn.createStatement();
            String sql;
            sql = "SELECT id as ID , name as NAME FROM school_tbl";
//            sql = "update school_tbl set name = 'abc'";
            stmt = conn.prepareStatement(sql);
            ResultSet rs = stmt.executeQuery(sql);
//            stmt.execute(sql);
//            System.out.println(stmt.getUpdateCount());

            ResultSetMetaData metaData = rs.getMetaData();
            System.out.println(metaData.getColumnCount());
            for (int i = 1; i <= metaData.getColumnCount(); i++) {
                System.out.println("getCatalogName: " + metaData.getCatalogName(i));
                System.out.println("getColumnType: " + metaData.getColumnType(i));
                System.out.println("getColumnLabel: " + metaData.getColumnLabel(i));
                System.out.println("getColumnClassName: " + metaData.getColumnClassName(i));
                System.out.println("getColumnName: " + metaData.getColumnName(i));
                System.out.println("getColumnTypeName: " + metaData.getColumnTypeName(i));
                System.out.println("getSchemaName: " + metaData.getSchemaName(i));
                System.out.println("getPrecision: " + metaData.getPrecision(i));
            }

            // 展开结果集数据库
            while (rs.next()) {
                // 通过字段检索
                int id = rs.getInt("id");
                String name = rs.getString("name");

                // 输出数据
                System.out.print("ID: " + id);
                System.out.print(", 站点名称: " + name);
                System.out.print("\n");
            }
            // 完成后关闭
            rs.close();
            stmt.close();
            conn.close();
        } catch (SQLException se) {
            // 处理 JDBC 错误
            se.printStackTrace();
        } catch (Exception e) {
            // 处理 Class.forName 错误
            e.printStackTrace();
        } finally {
            // 关闭资源
            try {
                if (stmt != null) stmt.close();
            } catch (SQLException se2) {
            }// 什么都不做
            try {
                if (conn != null) conn.close();
            } catch (SQLException se) {
                se.printStackTrace();
            }
        }
        System.out.println("Goodbye!");
    }

    @Test
    public void test() {
        String sql = "SELECT am, bname FROM scopl_tbl WHERE id = #{Id}, anme=#{anmge}";

        String reg = "#\\{\\w+\\}";
        Pattern pattern = Pattern.compile(reg);
        Matcher m = pattern.matcher(sql);
        List<String> list = new ArrayList<String>();
        int i = 1;
        while (m.find()) {
            System.out.println(m.group(0));
            i++;
        }
    }

    public List<User> setU(int a) {
        return null;
    }

    @Test
    public void tsss() throws NoSuchMethodException {
        String[] strs = "java.util.List<com.mjlf.framework.mydata.User>".split("[<>]");
        for(String str : strs){
            System.out.println(str);
        }
    }
}